firmament update

There is nothing in the Minecraft sky at this time.
So I think we need a new element in the sky.
Dungeon ... Cloud Castle, firmament Fortress, etc.
Biome ... firmament island, firmament forest, firmament desert, firmament cave, etc.
New items and new blocks ... Cloud blocks, firmament soil, firmament stones, cloud trees, cloud sand, crunium, etc.
New tools ... tools such as crunium armor, crunium swords and pickaxes
New mobs ... firmament beasts, firmament villager variants, firmament undead mobs, firmament flying mobs, etc.
Conditions to be generated ... It is generated at a super high position.
Its height is 250 blocks high, it takes a long time to reach it, and there is a risk of falling.
If you have any other good ideas, let us know in the comments.
Thank you for taking a look at my thoughts.